Pros
Some very smart dedicated people who can do great work when they want to. Have created some great campaign - matched by some of the worse campaigns ever - created because the partners wanted to travel to exotic locations and hobnob with the rich and famous.
Cons
Working with partners who are alternatively patronizing (especially to women: mansplaining and stealing women's ideas by repeating them louder than women voiced them is relentless and shocking), insulting, interested in what you are saying, or lying to you. You constantly spend your time trying to figure out which is which and what will be next. Very little sense of strategic direction - is SS+K an ad agency for luxury clients, a social policy or social activation agency, an incubator for ideas, a ....? Or are they simply fishing for any clients or any campaigns they can get? A series of failed and non-failed mergers and partnerships adds to the sense of confusion.